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When working with metadata through the API, the recommendation is to use the API rather than working with the item directly.
The API returns a well-defined data model of type AssetMetadata which contains the following properties and methods:

Property name	Type	Stampvalue	Description
Name	String	{stampvalue-asset:name}	The title of the asset.
Description	String	{stampvalue-asset:description}	The description of the asset.
ItemId	Srting	{stampvalue-asset:itemid}	Sitecore item Id.
AssetId	Int	{stampvalue-asset:assetid}	This is a unique id descending from the DAM Center.
AssetTypeId	Int	{stampvalue-asset:assettypeid}	This is a unique id, representing what type the asset is. E.g. The assettype for images is 4 and the assettype for videos is 1. This id can be mapped to an item using this location:system/modules/Digizuite/[silo id]/AssetTypeRoot
AssetTypeName	String	{stampvalue-asset:assettypename}	The name of the asset type.
AssetSiloId	String	{stampvalue-asset:assetsiloid}	The Sitecore itemId of the silo in which the asset is located.
AssetSiloName	String	{stampvalue-asset:assetsiloname}	The Sitecore item name of the silo in which the asset is located.
HashSha1	String	{stampvalue-asset:hashsha1}	The HashSha1 of the source file. Can be use to test if the fysical file of the asset has replaced.
ImportedBy	String	{stampvalue-asset:importedby}	The name of the user who uploaded the asset.
LastModified	DateTime	{stampvalue-asset:lastmodified}	The change date.
UploadDate	DateTime	{stampvalue-asset:uploaddate}	The upload date.
Filesize	Long	{stampvalue-asset:filesize}	The file size of the original file in bytes.
FilesizeAbbreviated	String	{stampvalue-asset:filesizeabbreviated}	A more readable version of the file size ex. 606.34 KB
FileExtension	String	{stampvalue-asset:fileextension}	The extension of the original file.
Duration	String	{stampvalue-asset:duration}	If the asset is of type video, then this is the length of the video.
Width	Int	{stampvalue-asset:width}	The width of the original file.
Height	Int	{stampvalue-asset:height}	The height of the original file.
Cropname	String	{stampvalue-asset:cropname}	The cropname.
DynamicMetadata	IDictionary<string, string>	{stampvalue-asset:[enter metafield guid]}	This dictionary contains all the dynamic metafields from the DAM Center. The key is the Metafield Guid. All metafields can be found either in DAM Center or in the administration section DFS 11.0 - Show Settings. Look for the property DynamicMetafields. If you use the stampvalue, it would look like this: {stampvalue-asset:5eb3eefc-a043-410f-89b0-29ed3ef37078}
Transcodes	IDictionary<string, AssetTranscode>	NA	A list of all transcode for the asset.
Crops	List<AssetMetadata>	NA	A list of crops for the asset. Be aware that this property is only available from version 11.0.2.

Method name	Description	Example of return value
GetMediaUrl()	Returns the media URL for the source file.	/media/512ffeba519249ff866095d7a25846ec/1-source
GetMediaUrl(string mediaFormatId, int resizeWidth = 0, int resizeHeight = 0, bool keepAspectRatio = true, bool allowUpScale = false))	Returns a media URL for the specified quality (mediaFormatId). This gives the opportunity resize the image. By default the keepAspectRatio is true and allowUpScale is false.	/media/512ffeba519249ff866095d7a25846ec/1-50044/resize/100x0/options/keepaspectratio
GetDownloadUrl()	Returns the download URL for the source file.	/media/512ffeba519249ff866095d7a25846ec/1-source/options/download
GetDownloadUrl(string mediaFormatId)	Returns the download URL for the specified quality (mediaFormatId).	/media/512ffeba519249ff866095d7a25846ec/1-50044/options/download
GetDigizuiteStreamingUrl(string mediaFormatId)	Returns a media URL for the specified quality.	/media/512ffeba519249ff866095d7a25846ec/1-50045
GetQualityName(string quality)	Returns the quality name.	JPG Small

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Code Block

language	c#
linenumbers	true

AssetlistField assetList = Sitecore.Context.Item.Fields["AssetList"];
if (assetList != null)
{
	foreach (var asset in assetList.Assets)
		{
		// To request the rendering html for the asset you call the
		// RenderAsset method. It returns an RenderFieldResult object
		var renderResultItem = asset.RenderAsset(); 
		var title = asset.AssetMetadata.Name;
		var id = asset.AssetMetadata.AssetId;
		var assetTypeId = asset.AssetMetadata.AssetTypeId;
		var assetTypeName = asset.AssetMetadata.AssetTypeName; 


		// Get dynamic metadata by guid
		var someDynamicMetadata = asset.AssetMetadata["5034306e5ec7f-68c8-4bac-95ce-4f8cbea69c60"];
	}
}

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